Two people were murdered during a strike at the Media Luna mine in Guerrero, Mexico, just five hours south of the capital where officials from the US, Mexico, and Canada were meeting for fifth-round negotiations to improve NAFTA provisions dealing with worker protections. Mexican military officials identified the aggressors as a faction of armed civilians who self-identify as the “Tonalapa Community Police”, but only detained the suspects briefly before releasing them. Leaders from the employer-controlled labor federation Confederación de Trabajadores de México (CTM) were reportedly among those responsible for the attack. False unions like this one are all too common in Mexican Labor Relations, and the striking workers were demanding that the CTM be removed and replaced with the National Union of Mine, Metal, and Steelworkers (Los Mineros) when the attack began.
See "Two Workers Assassinated in Mexico: NAFTA Renegotiation Is More Important Now Than Ever", Celeste Drake, Upside Down World, November 21, 2017